hotplug polling, take 4

Hello, all.

This is the fourth take of hotplug polling patchset.  As the name
implies, this patchset implements hotplug by polling.  hp-poll is used
to

* Monitor ports EH gave up.  When EH gives up on a port, it freezes
  the port to protect the rest of the system from it.  The user used
  to have to issue manual scan to retry the port.  hp-poll can monitor
  such port and retry it when hotplug event is detected.  This is also
  used by PMP support.

* Support hotplug on controllers which can report hotplug conditions
  but cannot raise interrupt.

Changes from the last take[L] are.

* updated to the current upstream

* global hp_poll_list and hp_poll_work replaced with per-host
  hp_poll_task

This patchset is also available in the following git tree.

  http://htj.dyndns.org/git/?p=libata-tj.git;a=shortlog;h=h...
  git://htj.dyndns.org/libata-tj hp-poll
  (web is temporarily down, but git pull works)

Thanks.

--
tejun

[L] http://article.gmane.org/gmane.linux.ide/12151


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